LG-11463 Add StepInfo for PhoneErrorsController

[soniaconnolly]

🎫 Ticket

LG-11463

🛠 Summary of changes

Add StepInfo for PhoneErrorsController, and use :confirm_step_allowed before action. Jumping to to the failure page is still handled by the rate_limiting code, which is separate from FlowPolicy.

📜 Testing Plan

• Create account, start IdV
• Try to jump ahead to /verify/phone/errors/warning, expect to go back to current step
• Try to jump ahead to /verify/phone/errors/jobfail, expect to go back to current step
• Try to jump ahead to /verify/phone/errors/failure, expect to go back to current step
• Fail the phone step with phone number 703-555-5555
• Click back from the warning page, expect it to work
• Return to phone step, resubmit 703-555-5555, expect to land on the warning
• Type in /verify/enter_password, expect to land on phone step
• Continue entering 703-555-5555 until you get rate-limited
• Click back, expect to remain on /verify/phone/errors/failure page until going back to verify_info
• Type in /verify/enter_password, expect to land on /verify/phone/errors/failure

[solipet]

LGTM - Ran through test plan with Sonia and works great.